<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js./vue.js"></script>
</head>
<body>
    <div id="root">
        <h2>今天天气很{{info}}</h2>
        <button @click="changeWeather">切换天气</button>
    </div>
<script>
    new Vue({
        el:"#root",
        data:{
            isHot:true
        },
        computed:{
            info(){
                return this.isHot?'炎热':'凉爽';
            }
        },
        methods:{
            changeWeather(){
                this.isHot=!this.isHot;
            }
        },
        watch:{
            isHot:{
                handler(newValue,oldValue){
                    console.log("王冉婷",newValue,oldValue)
                }
            }
        }
    })
</script>

</body>
</html>